1 files changed, 35 insertions, 0 deletions
diff --git a/test/functional/plugin/man_spec.lua b/test/functional/plugin/man_spec.lua
index 58da059be6..9730bf4bf6 100644
--- a/test/functional/plugin/man_spec.lua
+++ b/test/functional/plugin/man_spec.lua
@@ -8,9 +8,29 @@ local nvim_prog = helpers.nvim_prog
 local matches = helpers.matches
 local write_file = helpers.write_file
 local tmpname = helpers.tmpname
+local eq = helpers.eq
 local skip = helpers.skip
 local is_ci = helpers.is_ci
 
+-- Collects all names passed to find_path() after attempting ":Man foo".
+local function get_search_history(name)
+  local args = vim.split(name, ' ')
+  local code = [[
+    local args = ...
+    local man = require('runtime.lua.man')
+    local res = {}
+    man.find_path = function(sect, name)
+      table.insert(res, name)
+      return nil
+    end
+    local ok, rv = pcall(man.open_page, 0, {tab = 0}, args)
+    assert(not ok)
+    assert(rv and rv:match('no manual entry'))
+    return res
+  ]]
+  return exec_lua(code, args)
+end
+
 clear()
 if funcs.executable('man') == 0 then
   pending('missing "man" command', function() end)
@@ -173,4 +193,19 @@ describe(':Man', function()
       funcs.system(args, {''}))
     os.remove(actual_file)
   end)
+
+  it('tries variants with spaces, underscores #22503', function()
+    eq({
+       'NAME WITH SPACES',
+       'NAME_WITH_SPACES',
+      }, get_search_history('NAME WITH SPACES'))
+    eq({
+       'some other man',
+       'some_other_man',
+      }, get_search_history('3 some other man'))
+    eq({
+       'other_man',
+       'other_man',
+      }, get_search_history('other_man(1)'))
+  end)
 end)